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CVE-2016-15059

Net::IDN::Punycode versions before 2.301 for Perl allow a heap buffer overflow via unchecked writes past the output buffer in encode_punycode

Critical9.8EPSS 0.42%
Published
Updated
Reserved
Assigned by
CPANSec

Description

Net::IDN::Punycode versions before 2.301 for Perl allow a heap buffer overflow via unchecked writes past the output buffer in encode_punycode. The XS backend builds the encoded label in the string buffer of the scalar it returns, sized from the input length. The loop that emits the digits of each code point checks for room before every write, but the write of the last digit of each round and the write of the terminating NUL do not, so an input whose encoded form fills the buffer writes past its end. Only the XS backend is affected. Encoding an attacker-supplied string corrupts the heap.

Scores

CVSS scores of CVE-2016-15059, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Deferred3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.42% · top 64% of all CVEs (2 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

Affected products

  • Net-IDN-Encode

    • affected < 2.301

What to do

Solution: Upgrade to Net-IDN-Encode 2.301 or later.

References (4)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .